Rotary pump



y 23, 1935 A. A. MORAN 2,002,862

ROTARY PUMP Filed Aug. 14. 1934 INVENT OR.

Patented May 28,1935

UNITED STATES PATENT OFFICE 'iGiairns.

This invention relates to a type of pump which employs a hollow coil or compressible material and means for compressing the same so as to create a suction in one part of the coil and a pressure to expel the contents from the other side.

Pumps have been made heretofore, which operate on this principle, but they have not come into general use.

My present invention aims to overcome disadvantages which are inherent in similar pumps shown in the prior art. A disadvantage inherent in pumps of this character heretofore proposed lies in the fact that pressure is exerted directly on the hose element by a moving member. A further disadvantage is that in the prior art pressure is exerted at a given time on only a limited area. This results in excessive wear. My invention aims to overcome the above disadvantages and provides a construction, wherein wear on the compressible element is greatly minimized, the compressing iorce being distributed over a wide area and the compressing action being transmitted to the compressible coil without causing the moving member to ride directly on the coil.

I'br further disclosure of the above and more detailed features or the invention, reference is to be had to the accompanying drawing, in which- Fig. i is a transverse vertical section of a pump embodying the invention; Fig. 2 is a longitudinal section on line 1-2 of Fig. i; Figs. 3 and 4 repre sent respectively the views of a modification, Fig. 4 being taken on line 4-4 of Fig. 1.

Referring in detail to the drawing, iii and I! represent complementary parts of a casing between the flanges of which a suitable gasket or spacer member II is disposed. Housed within the casing thus formed, I provide a coil spring it formed of flat stock. One end of the spring is anchored as at II, in the casing It. The other end is iree. Between the convolutions oi the spring is interposed the hollow coil or hose of compressible material indicated at 20. A suitable inlet boss 2! is formed on the casing and the inlet extremity oi' the coil passes through this boss and a suitable flange or fastening device 26 is provided for connection with an inlet pipe or other duct. The outlet portion 20 of the hollow compressible member is preferably provided with means to compensate for the lengthening and shortening occasioned by the compression of the same when a pump is in operation.

In the embodiment illustrated in Fig. 1, this compensating is provided for by forming an accordion-like portion 30 near the outlet end of the hollow coil and the coil is formed with a' flange portion I2 adapted to be clamped or otherwise secured to the flange 84 on the end oi the outlet boss of the casing.

The pump is driven from any suitable source of power by applying a torque of requisite mag nitude to the drive shaft 38, which has keyed or otherwise secured thereto a rotor 40, one iace II of which rides over one face N of one convolution oi the spring I6. In the construction shown and described, it is apparent that the hollow coil of compressible material is interposed between the convolutions of the substantially helical coiled spring and that upon rotation of the rotor III the same will successively compress different portions of the coil between the convolutions of the spring. Thus, the material of the coil will not be subjected to the wear of the rotor. it being clear that the friction action takes place between the rotor and one face of the spring. It is also apparent that as the member Iii revolves a large arcuate portion of the hose will be collapsed, thus distributing the load over an arc of considerable length due to the stifl'ness of the spring instead of concentrating at a single zone as in prior devices.

Figs. 3 and 4 illustrate an alternative construction for compensating for the lengthening of the hose due to compression thereof. In this arrangement. instead of providing the accordion-iike portion as at Fig. 1, the outlet extremity It oi the core is of the same size and sectional area as the coiled portion and the flange 32 is secured to the flange ll of the casing. To compensate for the lengthening action of the hose due to the rotation of member 40, the chamber oi the boss is enlarged as compared to the diameter oi the hose and is preferably of substantially elliptical section thus giving ample space to accommodate the hose.

While I have described quite precisely certain specific details or the embodiment of the invention herein illustrated it is to be understood that various modifications and substitutions of equivalents may be made by those skilled in the art without departure from the invention as defined in the appended claims.

What I claim is:-

i. A pump comprising a coiled spring, a hollow coil of compressible material interposed between the convolutions of said coiled spring and a rotor coacting with the spring for successively compressing diiiferent portions 0! said coil.

2. A pump comprising a coiled tubular flexible member, a helical spring nested therewith and means for successively compressing diiierent portions of said member between the convolutions of said spring.

3. A pump comprising a coiled tubular flexible member, a helical spring of flat stock nested therewith. and a rotating member coacting with the spring to successively compress different portions of said member between the convolutions of said spring.

4. A pump comprising a casing. a helical spring having one end secured thereto, a hollow compressible coil nested between the convolutions of the spring and means rotatable in said oasing for successively compressing different portions of said coil between the convolutions of said spring.

5. A pump comprising a chambered casing, a helical compression spring of flat stock having one end secured thereto and the other end free, a flexible tubular coil nested between the convolutions of said spring and a rotary member which rides repeatedly over one face of a single convolution of the spring at the free end thereof.

6. A pump comprising a chambered casing, a helical compression spring of flat stock having one end secured thereto and the other end free, a rotary member coacting with said spring, a flexible tubular coil nested between the convolutions of said spring, said coil having inlet and outlet portions respectively secured to the casing at its opposite extremities and means for compensating for the lengthening and shortening of the coil occasioned by the operation of said rotary member.

7. A pump comprising a coil spring, a hollow coil of compressible material interposed between the convolutions of said spring and a rotor coacting with the spring for successively compressing different portions of said coil, a casing to which one end of the spring and the inlet and outlet ends of the hollow coil are respectively secured and means for compensating for the lengthening and shortening of the coil.

ARCHIBALD A. MORAN. 

